Is Geometric Nexus legal in Standard, Modern, and Commander?

Geometric Nexus is legal in: Legacy, Vintage, Commander.

What type of card is Geometric Nexus?

Geometric Nexus is an Artifact. Its oracle text reads: "Whenever a player casts an instant or sorcery spell, put a number of charge counters on this artifact equal to that spell's mana value. {6}, {T}, Remove all charge counters from this artifact: Create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it, where X is the number of charge counters removed this way."

Geometric Nexus

Artifact

Whenever a player casts an instant or sorcery spell, put a number of charge counters on this artifact equal to that spell's mana value.

, , Remove all charge counters from this artifact: Create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it, where X is the number of charge counters removed this way.